200 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



57 (Chilomo, Honduras). — Salvin, Ibis, 1861, 353 (Honduras). — Boucaed, 



Liste Ois. Guat., 1878, 36 (Guatemala). 

 ICasMix} orygivora SchATER a,nd Salvin, Nom. Av. Neotr., 1873, 39, part. 

 Corvus [Cassidix} mexicanus (not Corvus mexicanus Gmelin) Lesson, Traits 



d'Orn., 1831, 433 (ex Corvus mexicanus Gmelin). 

 Coisidix mexicanus Cassin, Proc. Ac. Nat. Sci. Phila., 1866, 416 (Mexico; Central 



America; monogr. ). 

 C[assidix1 oryzivora viexicana Bangs, Proc. New Engl. Zool. Club, ii, June 30, 



1900, 11 (in text). 

 Cassidix oryzivora mexkana Bangs, Auk, xviii, 1901, 370 (David, Chiriqui). 

 Casddix crassirostris? (not Scaphidura crassirostris Swainson) MooEE, Proc. Zool. 



Soc. Lond., 1859, 57 (Omoa, Honduras). 



Genus CALLOTHRUS Cassin. 



Callothrus Cassin, Proc. Ac. Nat. Sci. Phila., Mar., 1866, 18. {Type, Psarocolim 

 leneus Wagler). 



Rather small unicolored terrestrial Icteridse with bill shorter than 

 head, stout (basal depth more than half the length of culmen), the 

 maxilla shallower subbasally than the mandible; inner web of prima- 

 ries conspicuously widened beyond middle portion, the widened por- 

 tion terminating on second and third quills in a conspicuous tooth-like 

 point; adult male with a conspicuous erectile ruflf on sides of neck. 



Bill shorter than head, stout-conical, with upper outline decidedly 

 though slightly curved, its basal depth decidedly more than half the 

 length of culmen, its basal width nearly half the length of culmen; 

 culmen straight in middle, slightly convex terminally and basally, dis- 

 tinctly but not sharply ridged; gonys straight, decidedly shorter than 

 maxilla from nostril; commissure strEtight or nearly so about as far as 

 beneath nostril, then strongly and rather abruptly deflexed to the 

 rictus. Nostril small, roundish, partly surrounded posteriorly by 

 dense feathering of the frontal anti«, with membrane visible above 

 posterior portion only, and this nearly covered by the frontal feathers. 

 Wing moderate or rather long, more than four times as long as cul- 

 men, nearly live times as long as tarsus, its tip moderately produced 

 (about as long as tarsus), pointed or subtruncate; ninth, eighth, and 

 seventh primaries equal and longest, the sixth but little shorter; inner 

 webs of longer primaries conspicuously expanded beyond middle, the 

 widened portion on second and third ending in a distinct tooth-like 

 point or projection. Tail about two-thirds as long as wing, slightly 

 rounded, the retrices broadest terminally, with rounded or nearly 

 truncate tips. Tarsus decidedly longer than culmen, its anterior scu- 

 tella distinct; middle toe, with claw, equal to or very slightly longer 

 than tarsus; lateral toes with claws reaching to or slightly beyond 

 base of middle claw; hallux nearly as long as lateral toes and much 

 stouter, its claw decidedly shorter than the digit. Feathers of hind- 

 neck and sides of neck elongated, developed in adult males into a very 



